Trained for duty overseas with B-17's. Moved to England, Apr-May 1943, and assigned to Eighth AF. Served chiefly as a strategic bombardment organization throughout the war. Flew its first mission on 13 Jun 1943, bombing an airdrome at St Omer. After that, attacked such strategic objectives as the port of St Nazaire, shipyards at Kiel, an aircraft component parts factory at Kassel, a synthetic rubber plant at Hannover, a chemical factory at Ludwigshafen, marshalling yards at Frankfurt, oil facilities at Merseburg, and ball-bearing works at Eberhausen.

Withstood repeated assaults by enemy interceptors to bomb an aircraft factory at Regensburg on 17 Aug 1943, being awarded a DUC for the mission. Braving adverse weather, heavy flak, and savage fighter attacks, the group completed a strike against an aircraft parts factory in Brunswick on 11 Jan 1944 and received another DUC for this operation. Took part in the campaign of heavy bombers against the enemy aircraft industry during Big Week, 20-25 Feb 1944. Sometimes operated in support of ground forces and flew interdictory missions. Prior to D-Day in Jun 1944, helped to neutralize V-weapon sites, airdromes, and other military installations along the coast of France. On 6 Jun bombed enemy positions in the battle area to support the invasion of Normandy. Struck troops and gun batteries to aid the advance of the Allies at St Lo in Jul and at Brest in Aug. Covered the airborne attack on Holland in Sep. Hit marshalling yards, airfields, and strong points near the combat area during the Battle of the Bulge, Dec 1944-Jan 1945. Bombed transportation, communications, and oil targets in the final push over the Rhine and across Germany.

After V-E Day, dropped leaflets to displaced persons and German civilians. Returned to the US in Dec 1945. Inactivated on 21 Dec 1945.